Got S+ on professional mode in Separate Ways!
Originally I was thinking of doing a hardcore run, but then I thought why not go straight to professional, how hard could it be? Turns out quite hard.
It took me many reloads, but it felt good to finally beat it. I only had elite knife unlocked from previous run and used SR M1903 as my main weapon. I learned I still suck at aiming as I finished the final boss fight with one rifle bullet left. Had to run for my life in the final section.
The most frustrating moment in the entire run was losing my perfect (no-hit) final fight against Black Robe to one of those moving boulders in the cave soon after the fight. I was so focused on saving ammo by avoiding enemies that I forgot to make sure I was in a safe spot. I was so mad with myself.
All in all, I’m really happy with the final time. I do feel a little exhausted though, so I'll probably take a break before another professional run.